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module for accessing a YubiKey

In an attempt to support any future versions of the YubiKey which
might not be USB HID devices, you should always use the yubikey.find_key()
(or better yet, yubico.find_yubikey()) function to initialize
communication with YubiKeys.

Example usage (if using this module directly, see base module yubico) :

    import yubico.yubikey

    try:
        YK = yubico.yubikey.find_key()
        print "Version : %s " % YK.version()
    except yubico.yubico_exception.YubicoError as inst:
        print "ERROR: %s" % inst.reason
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    Locate a connected YubiKey. Throws an exception if none is found.

    This function is supposed to be possible to extend if any other YubiKeys
    appear in the future.

    Attributes :
        skip  -- number of YubiKeys to skip
        debug -- True or False
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